After editing a post in the iOS app, the final preview window shows only about an inch of text below the title, rather than the complete post. This began when I downloaded the iOS app version 18.104.22.168, so I'm wondering if it's a bug. I'm using an iPad 2 running iOS 9.1. It happens on questions and answers, with and without pictures, and on a variety of SE sites.
The top row of my pictures show the original question, then the edit screen after editing. Below that on the left is the edit preview, with the finished version after submission next to it. Click on them for full-screen views.